Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37690c92d894ed3…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 07:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f034dc47ca5356c5902e7850dccdbafa SHA-1: 90f61aa771abf964c43037a9a92a598b51d13a63 SHA-256: b37690c92d894ed3813dba4c256c35fe3306306b5ac437e43e9d01a0699eea67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=common+name+of+sodium+hydroxide+is
    • http://tiszaladany.hu/upload/file/tujuvaxofagukiwavefudi.pdf
    • http://apnm.indexint.net/ckfinder/userfiles/files/sewetakalumamapinijigem.pdf
    • https://soccerauquebec.com/userfiles/file/24599328678.pdf
    • https://abouelhoulgroup.com/userfiles/files/verukomutigikef.pdf
    • http://gzafjc.com/uploadfile/files/56101039924.pdf
    • http://violetstudio.in/userfiles/file/duduwamak.pdf
    • http://villacappuccina.com/userfiles/files/mepilazuzojovofexib.pdf
    • http://maasmartcity.com/userfiles/file/vamanej.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/tapuxedosakaperekabil.pdf
    • http://sanraimundo.cl/dyn/uploads/file/61027546750.pdf
    • http://vswet.ru/f/19679262273.pdf
    • http://flamefitnessstudio.com/cewit/images/file/vudojololikuzopug.pdf
    • https://n-tlg.com/files/file/50357217423.pdf
    • http://polletnv.be/uploads/files/334114942.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/luwijopajubo.pdf
    • http://mdtrend.hu/files/file/retikute.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359da71676a---19032194851.pdf
    • http://bestbelly.org/content/files/files/13252520569.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/61669a662cd8d360c1d6946ec19a39b8/53019986312.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9igu6v3g660r1mg9kt4rnpo2ml/goxixapax.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e34a97bde59553d92edec286b6f42f2/22640581263.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b138.bin
fc7afcca2c4fbffc597ecb80be192c4848eb19104ee0c3e08f694d93311cd4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 17568 bytes
font_01_sfnt_off0000de32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 16792 bytes
font_02_sfnt_off0000f649.bin
8fd186a02c9f78a420cb01e7c0ff20f8b2af9010340d5889f13acbf6d2922989		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 10820 bytes

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